Night vision system and method
US9800802B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 17, 2012 |
| Grant date | Oct 24, 2017 |
| Priority date | — |
| Expiry date | Dec 26, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10F39/1847
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A night vision system and method for imaging an object at or near room temperature and in the wavelength region up to 2.5 microns is described. The includes a photodetector having a cut-off wavelength of 2.5 microns under the room temperature, an optical system configured for collecting light and focusing the collected light onto the photodetector, and a spectral filter located in an optical path of light propagating toward the photodetector. The spectral filter is configured and operable to selectively filter out light of wavelength shorter than a predetermined value, thereby gradually shifting operation of the night vision system from mostly reflection mode to a combined reflection and thermal mode, to allow the night vision system to detect light reflected from and emitted by the object being imaged.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.